Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1866de661b022cbc7ef2b0b3307d5a6ed2ce13ffe34d0cb7178aec1764629c' 
  AND token = 'Xd2CaCWUJkqf705YYCDjXWg/3Irm5DnPAaQfFBjSWjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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