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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4e5f9e3f1a33d37c8362b9a08176064d190b2c1b0885633290666485fbfdcf68' 
  AND token = '9qCUAb0AAZ5JHnJhCcjngpYHb5Fb9gjGF1BEZTbgyWg=' 
  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"
    }
  }
}