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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '19490b83356e94505f8d254827274d16cefa7be3d107103a9abb8efbefd198af' 
  AND token = 'gEcc24O6dWSE4ep0ITVJD/gxSDRFCo/3BRktQqDmKwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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