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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92c59f312e2f5f0ee1a68b88e378184a7c81d5ae8ccf80470970baf2da36d7d' 
  AND token = '0F6EIJFmr9E1kgtpQeqKHZ071WIHrq+X2t+xQoKWv8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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