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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc04551550bd83bc453fe5cc5f6fb936a2cf1b1a0ea72b3b989116f6e820878' 
  AND token = '8zVh4hVW77BOAHAn6iKNTI+QLJYz3WEcTu+T4rPJrrI=' 
  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"
    }
  }
}