Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8836029c38d999ec9426179290ebf74dabbfe9cd79315a8d6e25ce6e7d2f0145' 
  AND token = 'x9WmLECYjJEm8XrSR35qanmcAkMftiDagUmmM4lOFVs=' 
  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"
    }
  }
}