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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '19c547b31d7c9af8aa87dfe976d54de8f554008fd4169bb47280cc7c6d5cc1cb' 
  AND token = '7qfMsbkfaHF8YFOkhvtmQk47UIHnI8mAQvVA3cPlDV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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