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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c525742b76e5feafd3152c3ec6a5919a668269a9250be561298084bed31e183' 
  AND token = 'ouhWfnffD6J8Db/ASWauR/6RJhFB/Ugc9hWIWzVuWKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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