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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0278fb4fba4457796cbfa9c68b52f65337f100b814f231fc1d8421c9802018f9' 
  AND token = '8d6df5/TQIIwMP8qY6/Ef+WbKgX9e0E1MGmxe6sCKgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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