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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef8bb44b04de49d4c2b067a83da5e66b290991148dc0d8abba200d33ebdf567' 
  AND token = 'hBqv8TioRl84BXHxh4iR1Z6qYxyW0UjL94afeZfZ7qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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