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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cf71f38fc50322954a2208cb96edb4f23b8d4422e40141a68bcce94642f8b4' 
  AND token = 'AOKT1WErtDa7IXhaJOGt5VjubfmWkicEUVbGF0+HFUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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