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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1989568799ff0ae9191be541bf0e974f030fde77a87dca3e9458d7a0d1b87128' 
  AND token = 'ZJMeyxNWgZ0Wxa4+E52mKGwUu5TKjuj9psPWSE4V3Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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