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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43485ca31ef9b7c7d71e0c3778d8ee428dfa8f8ca0cec10481e537cb44854ae0' 
  AND token = 'JESIgwQ+67/q51lfOKG9mcfsu4KrK7M7mKzOtkTX8AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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