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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9f5b9ae232421c6cab929ead7dcbc7c394d4bf52e3ea2cff3acf4008129fc56a' 
  AND token = '58XXw3GIvdj+8FObttLCg8AJfjSyGo3o8k44ZkxZjqg=' 
  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"
    }
  }
}