Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cae963e575bcc2d1ef2b85668086fe38f7dd13e97f7119bafaac1504612957' 
  AND token = 'Y8JTjHT0R+EfyvIvgv2q74T97oQnMeDs5oDNUSKP/Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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