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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5790e6f039b298349a4f1ed8d06fb185a0a3c923b25d5f7079aa496982a6c72d' 
  AND token = 'RmLqTxLuHcDbT/8mNxTxtIQFAMqfN7fECYnsYBGtIQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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