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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe8b31df52fc11326cb28c3a5ed334a537b3b3f0d7f93dba47aab1ae351e657' 
  AND token = 'LYe27vpa9Fv3WRAY+tgrJcjxCk1JdpUvjbWgxvuUqLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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