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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cc4d991c257e09ec06859eb88310bb9e7b0ee4e5c030785aae12f229b298cb' 
  AND token = 'zoh0Da5LwIv5balCsBZPrxkZAe6XI8LUMZ9aVM/XOi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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