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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9b371b1cd69841c34848b1b42cc0f10fab5334f1f7b333971db1c1518598cac4' 
  AND token = 'BS2WqxeSXbSouJxO0EwUUDz0/SydnldTHMi3bfpuZYI=' 
  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"
    }
  }
}