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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcacc6fe27fa46cdf0bb22327d830c705314ecf1b0e371dab89adb4dd70fa483' 
  AND token = 'TuwZ+9wP2cN2tRzlF6Hds0lPSk0DpTaCUus6354q+44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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