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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ea950a9ef03de4d2ab92e840b2bd38f911948c7b910bf9379483e21898cbcfe3' 
  AND token = 'NAAuCj6TgpC75Gee5SpvTwuuCPKF1BN+EnB6zcmJ35s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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