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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6553aaf6c6a5c873527bf1485efc83e69cf46d5ae92f22a4c760e33dab01250c' 
  AND token = '9+SNpbLQxiIqnIlvnOIfvUR4oQ9W72rF55Cv5B2lFmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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