SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed659926caaa3cd28feb4f629de44e654d1ad5d6ce1118f067708ce67e902bb7' 
  AND token = 'NoLMzC6zll+n8I9JphkJB/aIV4HjQH+ZIKba4zYmBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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