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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4270d6cfd21301f237e704bbcfa7950948c7e31a2518fed7356f44a4f232408a' 
  AND token = '87T1hN3QVcVfEn/guRW2Gg04DBX3RwT6sL2MkdlH8Ko=' 
  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"
    }
  }
}