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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '26e9fe5b492fdab6fa56e4d1635e66fcd9116acb3d792b41ac292ddff5be7470' 
  AND token = '6AfNpzvP4joNEbeM+1gJ25z6cjIzZf1iZf/1rzQTgR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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