Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a709787d0d7c358da5e986971546903bed09e1ed31d0dcebb3604269edde9d3' 
  AND token = 'XDmpSnkBBr4URECutVIwBPsglAiq/K9OVWlCNWqsMOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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