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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a632b31557b40743e9be508283513430403ff6b5802cfd1abed826b0aeeeb25' 
  AND token = 'tivMQdi2QQnnuDReuy23OvESw8bROgjEbQ3oH6fW82k=' 
  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"
    }
  }
}