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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab612081b53beea28a0f5dad4f8a7514d15cab28c0438348c2ab40a6f479fd5c' 
  AND token = 'LKmetHm8HOi+X5rYLuqR6qS8FtiQrZ1JOoUplnmvTw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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