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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49a2377b60d8edfb963740a4d62be6795ff2b79a5f03d6060b750f3b5e1a633' 
  AND token = 'soTxo1fzYlIzVb/YWAyyFsvQGnKa+S42MYW38PUsJfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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