Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb6e2ea3841ccfa599f2b60e61a753f0d8423b68a5c6c6e5fd66efbec1686bd' 
  AND token = 'y10VmVIW++V3GVHFrGAv2rroEyXN/Oqsl5SSm3uydKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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