Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734541519f6ca8a0f8184d51096c1b838f4b7b3d9bdf1cd2546f3d7ede1dd1a2' 
  AND token = 'Ad1EH5us7FyVmfc38c1hSLC7BfakGZqauMEc0TwOtEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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