Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a2ff1d65cfc474706cc5904710bb3bd72c41db16e589418c13a74840f05ae0' 
  AND token = 'mIknGXzddGouVRutaN1f/Fx3PNoblUI+lBVLbXoSgXE=' 
  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"
    }
  }
}