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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dabb4b85039ae1583e68f1fc566c678986efc7df82e204d03248cf24b2b9505' 
  AND token = 'VWpyd+1yr+Fdtg02jh/B34P+tibH3Uc4RCjBq1haCQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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