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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '54955e750f729d26f98a1e0c740d5b9512c1d171ab24dda4f4adb2cf5d34ffed' 
  AND token = 'iVfEnNSZTcVRfsT6RSLVyHmmquNNMtxiNDQOtO7X4mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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