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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de4b38ff3444113c6281feeb383ea47cd9718060b061d5890ade5a144a2bb66' 
  AND token = 'h8AaWKh0HNswsy9TupDGZk02b3hSHQQ7sMeAx/77Y8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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