Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73fd52d2c1d3ce4a6bb3ca7f75786d83d451dbe03b154ded3503830b8693899' 
  AND token = 'XXBeVsezOC57QAzgzmCjatIdxpNFy3js1WQ5P9mDTys=' 
  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"
    }
  }
}