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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a34a70c7108544ea3f31ffc5adf99797bb88c2fd175a8223df69f9ca2dc83ed' 
  AND token = '763asLTRbY8xN2NeamFNahYJ5Ze6OkunPHHJMnrZuAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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