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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34acc7e6bc664db778654fbdb7f847ad14b03ae09fd3c10d3f32b09efd15027c' 
  AND token = 'ysxLoIzQlgBH+W6tJW8/K8E02CDHJ0+ItnAZ5ueKE+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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