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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde971090b02ef25dd6e5ba8c944d2a85fb7c1b554c36c3b3979e1b71205264d' 
  AND token = 'zwyg6CofnXCd9kqoRj0sFuoH604U8J1fIBOj3wpGZWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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