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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dac576598bc426eebe47c0ab4a0eb38fe37bafd6b91da651c026e38e851aa561' 
  AND token = 'T4+g6iiefr13aXFIpnlcNNvWcx/nFJfE1cZ8ke4Ti7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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