Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68b19e1b006773962c6d9dc91bff4a0187236e1bd579310c31b64394bde3f87' 
  AND token = 'SsmBBz2uPmHebB+p9ImPr+popDNE+T4c+UCyP+u1oy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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