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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e81633e2a5b714fd922ae29269e6463de25993e3ba0809f292c5abead9cd4cc' 
  AND token = 'tBeyhRlD3jsjxFig+9Z1Wl88LBk/3hK4kh2bVVvg3Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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