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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e278066e64ccb20a6867564c1b893c5b572c99d5dc156e0c60c6b7d13ec559d' 
  AND token = 'F266TBBTKhtZElNNL+ohU7HNMUnEk5YlGJtYgcvyZgU=' 
  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"
    }
  }
}