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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1e79e74efa3965100e1032c8463963b0a21c7da305e3934d48ab2d1ce2faac' 
  AND token = '0G0pNrOXCa3JsVoRFp8F48/+EwBIZFIpNARjeihFbzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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