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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8d915b8e9027d123f37069465457a19aed130f6caedcdf49bc30d5500abd21' 
  AND token = 'W0t9OCtDaxMyr5MlrJ2E58ZJ3Z3fmzbG13b8h15V07A=' 
  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"
    }
  }
}