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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f82737038fcadaeb3c2503509e6f4101477055c5d317636df90b60b4b6b43ed' 
  AND token = '+JN3/xlKaOpSj+wJ/7zNfNMkcZczuySG5kPFKXxxt6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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