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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ab090be970da2f85f50952f94cef2b7824d16d1ec5274b3d1183d0a87db683' 
  AND token = 'kyLhfhFupDMZYSPwHNAT4h4be2LI9dJ6tqvIQpcTw/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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