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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece93f01fcf37aff73d5a9d5ee9333690324074b6d8f9a189e18f52e1121c4b5' 
  AND token = 'z2WqypEZ2BUiG43TC7ocApPWmXhyW/f/cGIVsUC2X3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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