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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c327e69ef6dfed792a189c1448c4c8394700116f033f26423c38e7b22a48f2b' 
  AND token = 'NlgctOTCWuexa7DYWgt4L4cbb2+bXNk4V5YJ1lrlXv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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