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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df484d3399c019f351f222dcb508fb74d8c5e9b62587f9d7a8d7ac826c49f6d' 
  AND token = 'i6yPac8uodYrXFpseRm6Pyvx12IhfuT2FtYu+mGTaBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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