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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9d6078f6c96546bf74bfae7f4463df167fd6446a2e9482e00191da2db45ce9f9' 
  AND token = 'uGIQTT9NbF1M+2oNrV+oxTo+eC5tCxn2K8lCepfREiQ=' 
  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"
    }
  }
}