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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea3d12fdd0a59fbbf537aae9ab6cb99b21058d619fb70162b8aab4aaf26aa07' 
  AND token = '5EjlIYu4EOIo6PHAIcV/V5eXV7NqVCWrfks61aAEafw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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