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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ca3972c41e4a7c5a6fc72e90e6fa7da8ae22a01f7360448aecf37b7c09eb7eb5' 
  AND token = 'QT+tRAg1r3ADXGiAMNMSHbTpus6VPAYeab2EVu5gmG8=' 
  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"
    }
  }
}