Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a515c40757102b7135acaa73bc747b8901620b15d205ef374c60bc66247ac5c' 
  AND token = 'k2azJtfZ+QIXe7ezeVo4ajWzGy4eij8E+GCe3uOQL08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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