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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a417b9db8ddc4df97d591ce9b8ede902cac9c8ef3e39461ef59e237663b7b2d' 
  AND token = 'fRFoLEQlRUhXIbakY9H0S//W0tElokW3343VczEFlUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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