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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a119fe0cdaf6e9aff48790c6a836d80c109c1830c4e9e495d58d5b89bc1b617' 
  AND token = '+rXzM5kT2oCQWF/v5nN43Xt/axb9HwSOx+iMoKwie2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}