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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '91a4b642cb0f01fec62859b15517313f020afb805423d5f82a5003e4339f9a38' 
  AND token = 'IpUdRCNEZhcaR+axfYTSIFxlYAwxPq2NSDjB8+MMb3o=' 
  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"
    }
  }
}