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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '390b01071e7e7a3bbc52c50d1a3bbec49ceeb40e9a930bb9f9e15fced0d79a1e' 
  AND token = 'dmtq7G5WA5jX59/s1PRuH7N6g1leWmtqxkCE/oBavi8=' 
  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"
    }
  }
}