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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3226706d2e9adbfa7524db1166ac1b42e8537de28f2c8f6d6de49cebc2ca552' 
  AND token = '3jmU33U/r89sS9vi7YnFGsULXWBTevzJlOke3kSeHN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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