Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b2062f21073b8a28c35583e88363bade5ddc21a24e27747cb5f19d1c4bb50d' 
  AND token = 'fIMRsQ9mhJQb90iavJyxfA70pdCR2ahpjjYOdwD5Shk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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