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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d62fa4c17423b43eadc37e633a6e6dca59bd49deeb79aa87e4058d6d194be27' 
  AND token = '+kcCuurXLmIYbv+eZFpFJiWg3CFVIbhjvcRuT2+R7vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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