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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '98a34286bb496ac1dbeb9fe02952d750bbb31b3a5ccf23b06d282ef3bfcd5bb4' 
  AND token = '7bPJgOdfLoRDau7uaKf4iQ9K2nd19PHLvS7YTTFYLSk=' 
  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"
    }
  }
}