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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '957e0a99e873f80968a42ce6bd289260c0e14bf4f106d0728257f9f441da94e8' 
  AND token = 'WhhZkr/295AFpWs/X8vcETYht8wIBjbZZHnr2cX1xzI=' 
  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"
    }
  }
}