SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7881e5409c7b9142d646f9eef7d7659167d69dbb59f7877b5313deb54f302b70' 
  AND token = 'YYnzHSScFHlkF9KmsJjQ+KmgoJcpf7/uqb5askoXJlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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