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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b53a8d36a125283d2fb11ccb9ad3f59cd38397468326e62fc1b09f21700ba4de' 
  AND token = 'JBDDYKnv/SE31wGGifNCtLqA6okA+X8Fcvbl3S6lWQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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