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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ab842afc83b9b3fbf4c36d058fa606808bcfeabe70097b52550d10dd478591bc' 
  AND token = 'G5lAlyk6qxsAbMb0uUPkqgJxu2Tho+UO2MAPb72Hy+c=' 
  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"
    }
  }
}