SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '703ac6d6f88e3011bfbc32e9f0181312deb774e691da7c391f95b1b60c708666' 
  AND token = 'SL3VckjDQHjWpjV+qxz/tyhItzT0fZ4t4T9/5gXEtqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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