Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabdfb1b1aea0e7599aa69654d74f441aac049f5e70abdad3cef3ad1999057ab' 
  AND token = '738RqxCGaDFYH2Xyb+fwOXM+cr/xDeAKSFzNRwvTmIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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