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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2013636ecf96961f6f2e1564b26ceb25ce9259c9a7695f643e40fae98dc5d0e3' 
  AND token = 'P4FNQVqPz8fPBAneyhC+DXnByIhDVCiLJ8zd698G8g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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