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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cba480735a59ccb83ed86edf83108b2268e706141d5e8237be8de6fe5c4aa2' 
  AND token = 'bLtkr/VmKJTb4TqB69IRtnZo7BIrOQoZKzgud5YZFKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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