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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '39db1722659cce1b3b7a573242176a19be786bc94bcc9b9ba6af75caff99e555' 
  AND token = 'nH5suSBhZzgECgRkCDrwch2CQDdUP9TP1hv5cNGonb8=' 
  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"
    }
  }
}