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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1976fd0e34b13a92d5f065eb4b5486cda6e16006c6773f6661a4704198e94f' 
  AND token = 'z9B/3/ynw1ZCKkzrXex0Y16Qaal++8KfTKJOwWLuTwM=' 
  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"
    }
  }
}