Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6068cbe1834ef30df7ea8611fe4d026723a24195471c79792002edd60d64a64e' 
  AND token = 'uO5z/iAxN2X1bedlJAR8Ip0cz/BosgowlvNucfZ3WA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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