Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a41822a1e722a7d3dec836386d38c9f30b6cf5bce1f2803eae4b702796f325' 
  AND token = 'LdQfoHsph7Cgd/oC2h7R7OAiXxrcdLTXlVlAEsFoTtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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