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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc89e7eeeb377dd212a4c92d57a9742856fad8101f3d74b391d9f24b3de63c0' 
  AND token = 'alZbOyzkGHRzSI+sGkasPvJbT+1ZibsK0LCFh/ynvdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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