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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caee3727e9c2bf3aa3a7853a35a496a03bab02dca64b0841a7927caf37d6429a' 
  AND token = 'h8b5b216ypNo+2S6oRFVt0lgaWMzBe/kd9tpP2XRo5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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