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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9a7fd3abbc7a12bb71e0c6f3c0a42aea8594e94593a2bf73057465bf7c68d5a9' 
  AND token = '1N9P0+gcJYtH5MS6NRXwDgj3MRRwLQ9lG9IyumgrPMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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