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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cd9441f11613d7922ac85bdd04cea004a4d103360e2e90a9b5fd7296a58ef4' 
  AND token = 'IdQHE6YCn9pX0BmYZ1TD2BKAKnB2Mee8S/9MdUTakUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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