Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c990dcf53294ad676875810d3769a6b5ab95633dfcd4e9daf7bee4b2eee88b5' 
  AND token = 'Nvzn7NJUOajx3K7Fme8wEAHxqD/TyFEMmfc1Vc+2o7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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