Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ebc543da86d6c533956e75a99ffafcf72b7ff8eaa21a41cfb146e2764cde19' 
  AND token = '9BHDuy8629kNo+btMd999isQmbvEXCc+FNCSc35NHuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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