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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d128afc9a0c6cc1ec3c57790b7a1192f4136138f69c317c67ed293a878474f6' 
  AND token = 'tdWV3JWycXSOjjsw/+HaBMzB+7e5y7i/qHYPSd/NKRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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