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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f98d7f63735f89a8dcee563b749799e71074fe3470de4de25424d1cf994dba4f' 
  AND token = 'gA3rQ0UH8pMD4F84pnzbahfS/8IzHXRkhZBfz71Aau0=' 
  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"
    }
  }
}