Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcfd06e61ce5351594a8b6b44b05e37e8108e4fabaca842a531f32d40ecc365' 
  AND token = 'OvtHT4ebNu7AzPDjmpnhemlzx5r1524CVEbS2kSc+NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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