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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '78f2c79853ed039ebe75541c0d2e2a6e1bf315272a3ea42b9e8352dabb34f588' 
  AND token = 'J5Jkb5mrrH1D6zNBbmECIn+YPHA6XMczr9SjE9adqEA=' 
  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"
    }
  }
}