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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b1523de67bab6c59039fee6a16011746f8634f0796f9987870517886a02ffdfc' 
  AND token = '89i4/caTog4n9ysluY826xuTZrkhtZItoSzIH2TYq9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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