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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd0b15847f2181231b3f5f249b0ef10faf92d6b212900f027a6c626dfa37ec9cb' 
  AND token = 'tcYL9QlF+cHSdavGG5yI1l1RvSUV+tuznP46/kqo2rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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