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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad532560d3da44c48212c45650e95d01946bc0be4886aa40745f2a4aa363eab' 
  AND token = '7ZlaiTLEEkWKsnNNoyg7Ot9D1jg28uTeq50P6Mu+MNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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