Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d00ff8a406178aa9e8cf79af0d652ef7c2cbdefd90b4200ae03fd0998e8c7d4' 
  AND token = 'I1hI8NNGp4ZlcnVzQwFvHZmh0wob2wTki7PPDPa1efw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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