Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117c61bb718feaf88a4ba18ac07b282df9e5027bc4cbcfe6a2294118025ea958' 
  AND token = 'flVUnLSnNsuOKsIpziAPSmtI+L2VfwWmXPw5m/sMkAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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