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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593c022a72d8545d2c844da52a3b3f237574748d52fca6ef58cef1d937ad6faf' 
  AND token = 'LiqZ9RF80SAnF+rdssxNe9P/S5N1bNxuss3F9P0qFos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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