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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '18ef19a7cda29bc826ba12cccc435b7489800fc0cfe4a4e85fb3291e5297098c' 
  AND token = 'yzX1hDU9fvT1P8uCrLTflQe8vqD57xHnzPSG6emVR+Q=' 
  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"
    }
  }
}